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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f06c3e1eb8d860f451b31104b7ee5676f260dacd8c95eda67e377d8b9c07738' 
  AND token = '2h+Qn0dP5IZhLbyRirwt5FSE/vQOSWZl2t2QJwQ6NdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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