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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d295f3a20aaa68538c062058dcb83b9e0a3812a26478d5823f95be44f450c0c' 
  AND token = 'EOiAMrWIPAv1hXpM0yxY6/+Lg5wK0ZQ2Q5wA8s9qqV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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