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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6253619caffc2c53a4514ae7a1933f30fe138bec7016dd119351b84e650fd9eb' 
  AND token = '3RKWkidnqbkg9YCIuKNkqa+18KE1eKf3tuhXEoYB2rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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