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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e05df40f763afbdbadec679af4e822ff0fe4d95c3395954acd7213974d6048' 
  AND token = 'Os5DAioW8OZ9sKU4O81NMA8e2Ya/P66lFbtXLt02RTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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