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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b73eb20294a9a7783a1b808268fc8917af9a383a784f3f9b52be385f18f5e4' 
  AND token = 'xL3Xx/XXCZYC+A18g7/ruyn3XgUzzeILDTaYL6j4cU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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