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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf6a3c9c908dd9a97002430b034c7dd2e07c59758b92bdb1b72a5094f2d0b28' 
  AND token = 'ldY1Rw/iVl8ByLC14YrHtvBXpa4UX/izR4JAaq5YYNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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