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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2912094cdd258ed3237a3d13f8ef6b012a79b53b61ff01979960ff6244bead47' 
  AND token = '5Hy4Bu6MJyZM8yrRAHZEZAkNpsQeNQFTqrVMSUv0m+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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