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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010367a0f7c3d5aeb6b1354fe315e6597a3653221a2e5d0a2f318183e349c40c' 
  AND token = 'rEdsyJJ6U1M+qPviA9T2Kqq/Ywu/BpwEOB8+694+knI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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