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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c1d61bad22f738c7a5e00f11d40583b43fe2ab4a252f7c0d93c81966b0f59f' 
  AND token = 'ZlUnzweuyPgcSvA6atdMElGFSWPF3aJlRP6sSPsXSw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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