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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbed3ad8683b2d3777a1cd60cc2be1fab6ba404a3c1d6a162742e8c00f151fc2' 
  AND token = 'AkPS1cat9wcLXUb/d3KLYooUjU9u66m6qRvV/WHA4Ok=' 
  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"
    }
  }
}