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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d82f6c8c1e4b0b2762d6110d82aa9e9e6dc97867d82090679e0ee361069348' 
  AND token = 'MbVDnN2fVDAB6pG4TPxnuEoodCnhEMOGD8JZmd/yY5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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