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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f321d1f61d67a8b89f80de73fa4a349e044fd35a4f3c73355df3bc3faab0bdd6' 
  AND token = 'ONrBZVzp+V+Ge9CEYMun1uWr7N9I4vBSbj+hfivTi78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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