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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d9e59cee1fc600a5e7d64642e89f5ea34c09f6cff08ebd793b52afa18aad00' 
  AND token = 'Kcr2nKPfMgkA5C8M2/v+U6K+qf6+35388LCFHvgKyTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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