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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee83b073ba1c6047b4c145da89f2660c8907a5dd67d4c57ce314b5e10034e356' 
  AND token = 'HK9qjZ6KhV2i4ahPPPXQ2LW80uynQo+uK7Ld4rAM+Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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