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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb34e0b63236a2d041bf14139ffc80a4cbc8ca7ac7d02f84a14a1a34e56e0ae' 
  AND token = 'bJMe/tyi3M+53JfFEQwJ+JqcyeZG9Fj94eSkCH8w4ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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