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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c7fc14ef96f2ba784c136cbd2902fa01b130c9b1fa1265ba550388220860c0' 
  AND token = 'tTQoU1N+QSq47r6tckbQ6ES3vJTsHVevsxz9QEaVSeo=' 
  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"
    }
  }
}