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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f2be95835bc34824ed8c8328c153337614f18182b8fce4170a8315b0ab0f0d' 
  AND token = 'tI4eWfkG4DrYzMDrUC/U1TD6l4BEbfmVJuuyPcT95ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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