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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7e26441c9684974c18e757180aaee96ee57fb0d74a7f7300a66016b3b28690' 
  AND token = 'ExkTRuynhYUo9Hu7jHI48DWz+DcmCYgSb6VBuFf14so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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