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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c975088cde81b4b85efe3bf4a0f2b72926cd824dd0139f106302b99e8d5f64' 
  AND token = 'fTaowLBDige90Ic6BASlC7MJE1LuLgq8LQn2wNkPuE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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