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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d871953eabb9225ff7912852c53ffc329f4353bec5d819fa8cbccc5820c52e' 
  AND token = 'xKc2koZR229Uc8Hg8MmImoLXY4EOn1R/tZO2KHkA86I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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