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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7ff3607e15e32a5326a0371f84b2b6435e2a093b7292065f76143346cdff26' 
  AND token = 'Yy0fKfopN4JzM2hkD1y8s9iwGDoVsgmOQAoo0SV+MWU=' 
  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"
    }
  }
}