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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6ea48833cb3a88f4ceb263bb5bf03b9aefd6aa35ab38082779ffd37f078e2f' 
  AND token = 'AIUdXEjnuYKii6rxMm5QRl+N4/CxDZxtfCcX15cH2Ms=' 
  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"
    }
  }
}