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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c0ceb149531c730a87d71570cbc6277c8cdea49b5243b1715bffede2ddf8b2' 
  AND token = 'uU0F3FYc9LtTku8eMOUZfufRFHCXZr/DBDepe5kQ88M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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