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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3537530f3346664624cda3f75fcdbe9b65ff62efd34233bd7af20ea75920b7c5' 
  AND token = 'W0ES6DCs6b81iEmQdzJskwqF3mDTA53H/55B/i7nU6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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