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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f4a7f40f077e152c151926c355399860cbab8bf091cf3e39fa0c78591c0215' 
  AND token = 'zd/QUy8aO61Rm/VYWdcAX4CRwNTpCUeNPNzfeQAA4/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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