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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ef690f5d1a3bfa507eea7d735318a015957b1ed800bec9106c5c50c305af9f' 
  AND token = 'SoGCZ7SJvC+3Gh+XcR7SxGtpB6OQI+Q6FLXemYyjLPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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