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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860c10f0cf830943ef937405f97d652cd01cf5187f6a097dd91f9b6f6e48410c' 
  AND token = 'cIfw1j605CKsK7JnvYDrMw203bkWmCIVzh7RiF93OK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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