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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590009179f7d06db61ae4beccce561e6621e8d56828f2eebc507b1236b48fc9a' 
  AND token = 'OxU2b/blMVzznsE3YNVuoZspkg0ZrDLFzO2UHX5GStQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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