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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9204406011aef2c29ccf6e40e2386218580453424a68a142dd907472365090bf' 
  AND token = 'EYw+n0ZN2uUu8K9PLb9Ho0wV2TOZvVT3pZl0bXiL+3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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