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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beae70829d6c9dc3a007299f9890949be63a4d59e56365ee0bb04b78c95cb59f' 
  AND token = 'xJU7qv6UJG/ulLCY7/JEbyiSxvSckI3jT3piBJNL9m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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