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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1798aa36bc576d49163a12e07e07d00912c6dcce75f5525d6196fe03ddf559bc' 
  AND token = 'HV6eDyVXe7jDRXhO6AUQvczVOm4xlO0JBm1/r1caM18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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