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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442d7dc3fba5767f491c1fdff28d2798ca48655555af51cd4dc2dd7088f77024' 
  AND token = 'XyEvXUqqWkKx28Ez6oAMKrran3aK9KiokX1d0aMTYaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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