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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a213ac547288a2a27f590ddbc9c4d0c0c24be2dc223d7006a01da085c51048' 
  AND token = 'MdNRM17lSmXepcsMyceyC9KH/YnHKPzooUfugVeYr6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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