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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41af3740f8d3347134a8f6a25a5f56379e60d93606f6e4c9150ecaf8abb659e' 
  AND token = '1S6jKW36kHwIpWNA4jJH4Jb+L5Qqa/4edp1Kjtbc0Mc=' 
  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"
    }
  }
}