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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd042dbd39a5b728d7463ab0e72524966f56afcd161a11dec7a05b96b6be3d0' 
  AND token = '1yBDHq1oMx9+P5sVbk0NfyBQpPYViRzIcptmb7JWrN8=' 
  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"
    }
  }
}