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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5b0b62ebf2a5c04a5140da7f46b8abf793c38dc467c62a3c82a4617bc87a41' 
  AND token = 'T1f/wxwfoSty+m/76VDzwOnbhchmjvkqzZ083rsgFC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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