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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2c38684d763b62dcb60fa4bb30930d07ee40b138ca6fae152d70dbf0b0a30c' 
  AND token = '+g0yFErRU0yRNPonCEco7uvOH/4+4lPPpig8Iyw1oZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}