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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02fad30a095208b66702e8e4f8a9a218779c3e4f048a0b30ab40a2621f59c32' 
  AND token = 'TvKuAkgK+4DHVq6A6xb2tt5HqdEPTMOtN73roGtFE9Q=' 
  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"
    }
  }
}