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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86a0910dd13ced4a0641bcbb2285f2fc9f726d4ea435c44bbd857fbdc62ee3b' 
  AND token = 'HFfBfGlF5UjbkrMe7+3P6Qz0jyLvf0fitw57odP7nIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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