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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2e217b0d6629a30aa572cee53c5c956770308ce29ef9fddbd36a4d4be42f87' 
  AND token = 'FjqrOfoTk++l3zyiZet6xQA1IClpCub94bPqXau2g3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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