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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524cae95f3e4f5e37e5c7cc4f3d1c5a9a496e7dbca70f0587ba985e8bd5ce70e' 
  AND token = 't9F0VsKiQ1SQsCc/Ss4lbxP4ParuhAQFfZK40/TAX1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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