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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0d3fed232692a2384f826c5d8204ffbaeca9beca5416681582dff3323a4825' 
  AND token = 'GoeMC/BJCR/P4teRzDN4Kf+6Eo7OTypkVtvCXmYVNAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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