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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9dc97b66de0aa9f14d1ef65976e74b134a7a15320fe3d716e6de0a9ede55b2' 
  AND token = '5ShwsVCg8vr8kFof28f2uWD1E0d7JLHlSEm4LBal+iQ=' 
  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"
    }
  }
}