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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa80dda829a3b3760f33a9d625f9f84afdc25b2c84c4e7d89feb862aaffd06cb' 
  AND token = 'P1/1EuYAAIdusTjGT/Y0E2Vc9YHtZcHZwpuy30nt294=' 
  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"
    }
  }
}