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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4388d67f43f67af665a172dcd07c78d2a039b116218464eda79cc1c2bd2dc312' 
  AND token = '9AAcEzywCK+KM3cvznR/J6U1+ePuSg6Y9ViG7IkL7mo=' 
  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"
    }
  }
}